Process for feeding black liquor to a smelting furnace



Dec. 25, 1934. A, G, KERNIN Filed Jam.V 9, 1952 PRO-(JESS FOR FEEDNG BLACK LIQUOR TO A .SMELTING FURNACE 2 Sheets-Sheet l Dec. 25, 1934. A. G. KERNIN ,985,504

PROCESS FOR FEEDING BLACK LIQUOR TO A SMELTING FURNACE Filed Jan. 9, 1932 2 .Sheets-Sheet 2 Patented Dec. 25, 1934 yPnocnss Fon FEEDING BLACK LIQUoR To A SMELTING FURNACE Alfred G. Kernin, Mosinee, Wis., assigner to v `Mosineelaper Mills Company, Mosi.nee-,Wi`s.,

a corporation of Wisconsiny Apparati@ January 9, 1932, serial No. 585,657

1 claim. (c1. ,ze-4s) This invention relates to the feedingofblack liquor into apparatus used in the reclamation of black liquor frompulp digestors.

`In my previous application, Serial No. 585,656, filed January 9, 1932, I have described a furnace for evaporating and. reducing black liquor. -In the furnacedescribedair, sodium sulfate and black liquor are introduced into the combustion chamber of the furnace in the form of a spray. The present invention relates to a method of spraying such a .mixtureto a furnace and 'also relates to a novel type of nozzle used in this process.-

. It is an object o-f this invention toprovide an .attachment for feeding air, black liquor and sodium sulfate to such a furnace.

It is a further object of this invention to provide an improved nozzle for mixing a gas, a liquid, and a solid and introducing them in spray form into a chamber. f

It is a still further object of this invention to provide an improved means for mixing a gas, a liquid and a solid and introducing them in spray form into a chamber, in combination with means for proportioning the amount of solid material used.

Other and further objects of this invention will be apparent from the disclosures in the following specification and the accompanying drawings which form a part thereof.

This invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

On the drawings:

Figure 1 is a side elevational view of a combined l.feeding and delivering apparatus embodying my invention.

Figure 2 is a view similar to Figure 1 partly in section and partly broken away to show the details of the feeding apparatus.

Figure 3 is a plan View on a reduced scale of the delivery apparatus.

As shown on the drawings:

My improved feeding apparatus comprises a feeding mechanism A and a delivery tube B.

The feeding mechanism A comprises a base 1, and upstanding supports 2 which are rigidly secured to the base by nuts 3 and 4 threaded thereon and which abut the upper and lower faces of the base. The uprights 2 are preferably four in number and spaced equally distant about the perimeter of the base. Platforms 5 and 6 are mounted on the support members 2 and are held thereon by nuts '7 and 8. Sleeves 9 encircle the upper portion of the supports and serve to space Platform 5 has a circular aperture 12 therein g whichy corresponds to and is aligned withA the` lower end of the hopper 11. A circular fiange 13 extends downwardly for. a substantial distance from the platform and defines theaperture 12. Bolts. 14 secured to platform 5 extend downwardly therefrom. A cylindrical sleeve l5 surrounds the flange 13, and is provided with an integral annular flange 16. TheV bolts 14 pass` through openings in the flange 16 of the sleeve 15, and nuts 1.7 are threaded on the-bolts 14 to keep the sleeve in position. 'Ihebolts 14 are threaded throughout their length to allow for the vertical movement of the sleeve 15 for-a purpose hereinafter described.

A rotatable shaft 18 extends upwardlyfrom a motor 19 mounted. on basev 14 and is located centrally of the aperture 12 and sleeve 15. The shaft 18 terminates within the hopper 11 and is provided at its end with a disc 20.

A collar 21 is provided on the shaft 18 a substantial distance below the flange 13. A disc 22 which rotates with the shaft rests on the collar 21 and is secured in place by a nut 23 which is threaded to the shaft 18. A plate 24 is secured to the uprights 2 by set screws 25. The plate 24 is provided wit-h an upstanding flange 26 which, when the plate is properly positioned on support 2 extends a short distance above the disc 22 and surrounds the latter for a distance considerably over half its circumference. A shaft 27 is supported on one of the uprights 2 by means of a collar 28, and a set screw 29. One end of the shaft 27 is provided with a wheel 30 so that the shaft may be rotated by hand. An arm 31a is threaded to the other end of the shaft and extends inwardly toward the shaft 18. A plow 31 is xed to the shaft 31a and rests on the disc 22. By the means just described, the plow may be adjusted back and forth on the disc, toward and away from the sleeve 15 for a purpose hereinafter to appear.

A hopper 32 which discharges into a tube 33 is mounted on the base 1 by a collar 34 and bolts 35. The discharge pipe 33 has a reduced portion 36 which extends vertically downward to a horizontal pipe 37 which is connected to the delivery tube B.

The feeding mechanism A is not of itself my invention but only in so far as it cooperates With the delivery tube B in forming a feeding device for a black liquor smelting furnace.

The pipe 37 is threaded in a reducing T 38 to which is also connected a pipe section 39. A pipe of substantially smaller diameter than the pipe 39 is threaded in the smaller end of the T and extends through the T 38 and the pipe 39.

The pipe 39 has a number of sections 42, 43, 44, which are secured together as collars and 45a. The section 43 may be an L section for a reason hereinafter given. The pipe 40 extends through these sections and terminates at a point 46, a slight distance from the end of section 42 of pipe 40, for a purpose hereinafter described.

Set screws 47 are used to centralize the pipe 40 in the pipe 39.

Inusingmy improved feeder for the purpose of delivering combustible material to a furnace, it is customary to connect the pipe 40 to a pipeline from a supply of black liquor. The pipeline 37 leads from a blower or pump (not shown) for forcing air through the line.

In practice, sodium sulfate is introduced into the hopper 11, the rotating disc 20 being utilized to prevent packing of the sulfate and clogging of the hopper. The sulfate drops down through the aperture 12 and onto the disc 22. The sleeve `15 may be adjusted up and down on the bolts 14 so as to regulate the amount of sulfate delivered to the disc-22. As the disc 22 rotates, the sulfate is scraped off by'the plow 31 and forced into the hopper 32. The flange 26 prevents the sulfate from sliding off the disc except at the opening to the hopper. The plow 32 may be adjusted toward and away from the sleeve 15 as an additional means of regulating the amount of sulfate delivered to the hopper. Sulfate is forced down in the hopper 32 and is delivered by the pipe 33 to the air inlet pipe 37 and is carried along with the air through the pipe 39. Liquor is introduced through the pipeline 40 and mixes with the sulfate and air at the end 46 of the pipeline 40, which is located a substantial distance within the pipe 39. By this means, the sulfate, air and black liquor are thoroughly mixed just before leaving the pipe and the liquor pipe terminating within the outer pipe tends to send forth the mixture as a spray or shower so as to facilitate the burning thereof.

While I have described my improved feeding apparatus as being utilized in feeding black liquor, air and sulfate to a smelting burner, it is evident that it may be put to many other uses where it is necessary to spray a mixture of a solid, a gas and a liquid into a chamber.

It will be seen that the apparatus described is very useful and advantageous in mixing a solid, a gas and'a liquid and in spraying themn into a chamber; and if air under sufiiciently high pressure be used, my device may be utilized in injecting such a mixture into a pressure chamber.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I, therefore, do not propose limiting the patent granted hereon otherwise than is necessitated by the prior art.

I claim as my invention:

The method of feeding a mixture of black liquor, air and sodium sulphate to a smelting furnace which comprises introducing air under pressure to the furnace, supplying sodium sulphate to the current of air at a distance from the furnace so that it is carried therewith, supplying black liquor to the furnace along a path surrounded by the path of travel of the air and sodium sulphate and mixing the black liquor with the stream of air and sodium sulphate at a point immediately preceding its discharge into the furnace, thereby causing the mixture to be discharged in spray form.

ALFRED G. KERNIN. 

